Answer:
The correct answer is b. recognizes foreign DNA sequences that have previously entered the cell and directs the Cas proteins to destroy them.
Explanation:
Clustered regularly interspaced short palindromic repeats (CRISPER) is the sequences of DNA found in the genome of prokaryotes and archaea. These sequences are added at a crisper locus in DNA by bacteria through capturing bacteriophage DNA during infection.
Then this sequence is used to detect a similar sequence of bacteriophage during subsequent infection and destroy them by Cas9 enzyme. Cas 9 enzyme uses a crisper sequence as a template to destroy similar phage DNA.
So the CRISPER Cas system provides an adaptive defense mechanism to bacteria against foreign DNA coming from bacteriophage. Therefore the correct answer is b.
Answer: Oxygen
This is because after chloroplast produces the plants release oxygen (from production by chloroplast) to get rid of it. Making it essentially waste product
An adaptation is the definition of the first one in the fact of the first century of that period in the first period in auburn
Organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere
